Malicious PDF — malware analysis report

Static analysis result for SHA-256 158e96ef83ac9821…

MALICIOUS

PDF

43.4 KB Created: 2020-08-12 19:25:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d8f9a6dc1377970c21796147f99e905a SHA-1: 4c135a52244d48e40d523c64aba8d2901e43dee8 SHA-256: 158e96ef83ac98210f85dfb2379e96330c62d1efba41521098546f4b9ada979b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains a URL that mirrors the malicious redirector, suggesting an attempt to disguise malicious links. The presence of a large number of external PDF links further indicates a link farm or spamming operation.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.cc/pify?keyword=alyson+noel+evermore+pdf+download
    • http://fowavur.thehorshamkitchencompany.co.uk/uploads/1/3/1/0/131070767/xozujexib_gudojadonanenab_dofezexoxiwer.pdf
    • http://malepofut.schoolagestars.com/uploads/1/3/0/9/130969352/bevilurox.pdf
    • http://files.brownstone-canberra-ec.com/uploads/1/3/1/4/131406544/8e8a7e0625.pdf
    • http://mekezojo.talkingaboutteaching.com/uploads/1/3/2/6/132695925/80ae563344e.pdf
    • http://files.mariamorjane.com/uploads/1/3/2/6/132682989/576a2d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/6991/5814/files/vofobakajikoniwuru.pdf
    • https://cdn.shopify.com/s/files/1/0431/6702/3259/files/fasolakiralubutamok.pdf
    • https://cdn.shopify.com/s/files/1/0432/6942/3269/files/xiserazizefanuminajij.pdf
    • https://cdn.shopify.com/s/files/1/0430/0007/0307/files/97691960449.pdf
    • https://cdn.shopify.com/s/files/1/0431/8245/7000/files/funota.pdf
    • https://cdn.shopify.com/s/files/1/0435/6354/8833/files/rijagapupijup.pdf
    • https://cdn.shopify.com/s/files/1/0436/0696/6429/files/sivejukofivelikezigubugox.pdf
    • https://cdn.shopify.com/s/files/1/0430/2677/6227/files/kopofuziregebusezuduvab.pdf
    • https://cdn.shopify.com/s/files/1/0428/5048/4390/files/28515515621.pdf
    • https://cdn.shopify.com/s/files/1/0432/4317/6091/files/d_d_classes.pdf
    • https://cdn.shopify.com/s/files/1/0429/9315/6259/files/derupefusi.pdf
    • https://cdn.shopify.com/s/files/1/0428/6365/7119/files/30985798364.pdf
    • https://cdn.shopify.com/s/files/1/0441/3505/5512/files/zudevivogefuxad.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006278.bin
19bd72b4e8c1d41de31f9074aa352bed53181f5d33993f2a2896a0763bd55d2e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6278 5428 bytes
font_01_sfnt_off000074f0.bin
90d137fb4a587b1d0333b3be488d9eb7322d8f04694d99357639fd4d504577de		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74F0 13832 bytes

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